31688049 has 8 divisors (see below), whose sum is σ = 42282400. Its totient is φ = 21109536.

The previous prime is 31688023. The next prime is 31688071. The reversal of 31688049 is 94088613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31688049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31687998 and 31688016.

It is not an unprimeable number, because it can be changed into a prime (31688009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1989 + ... + 8205.

It is an arithmetic number, because the mean of its divisors is an integer number (5285300).

Almost surely, 2^31688049 is an apocalyptic number.

It is an amenable number.

31688049 is a deficient number, since it is larger than the sum of its proper divisors (10594351).

31688049 is a wasteful number, since it uses less digits than its factorization.

31688049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7919.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 31688049 is about 5629.2138882796. The cubic root of 31688049 is about 316.4451911511.

The spelling of 31688049 in words is "thirty-one million, six hundred eighty-eight thousand, forty-nine".